RFR: Filter out PR-headers before sending mails

[Robin Westberg]

Hi all,

Please review this change that removes the "internal" PR-headers used by the mailinglist bridge to keep track of certain metadata. This data is used within the internal archives, but does not need to be sent out to actual mailinglists.

Best regards,
Robin

----------------

Commits:
 - 838f55b4:	Filter out PR-headers before sending mails

Pull request:
https://git.openjdk.java.net/skara/pull/133

Webrev:
https://webrevs.openjdk.java.net/skara/133/webrev.00

Patch:
https://git.openjdk.java.net/skara/pull/133.diff

Fetch command:
git fetch https://git.openjdk.java.net/skara pull/133/head:pull/133